package net.dopan.pigframe.core.base.controller.response;

import net.dopan.pigframe.core.utils.PageUtils;
import org.springframework.core.MethodParameter;
import org.springframework.data.domain.Page;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/**
 * @Package: net.dopan.pigframe.core.base.controller.response
 * @Title: PageResponseAdvice
 * @Description:
 * @author: 刘宽
 * @date: 2018/8/10 20:59
 */
@ControllerAdvice
public class PageResponseAdvice implements ResponseBodyAdvice<Object> {
    /**
     * Whether this component supports the given controller method return type
     * and the selected {@code HttpMessageConverter} type.
     *
     * @param returnType    the return type
     * @param converterType the selected converter type
     * @return {@code true} if {@link #beforeBodyWrite} should be invoked;
     * {@code false} otherwise
     */
    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }

    /**
     * Invoked after an {@code HttpMessageConverter} is selected and just before
     * its write method is invoked.
     *
     * @param body                  the body to be written
     * @param returnType            the return type of the controller method
     * @param selectedContentType   the content type selected through content negotiation
     * @param selectedConverterType the converter type selected to write to the response
     * @param request               the current request
     * @param response              the current response
     * @return the body that was passed in or a modified (possibly new) instance
     */
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        // 分页数据处理
        if (body instanceof ResponseBean) {
            PageBean page;
            if (((ResponseBean) body).getData() instanceof Page) {
                Page data = (Page) ((ResponseBean) body).getData();
                page = PageUtils.pageToPageBean(data);

            } else {
                return body;
            }

            return ResponseBean.builder()
                    .data(page)
                    .build();
        }
        return body;
    }
}
